I appreciate what you are saying and I agree if I was planning to shoot several weddings this summer, indoor & outdoor. But would you still say the same thing if I was only planning to shoot a handful of outdoor weddings where there is plenty of room to back up. I'm just not sure that I will feel limited by the 24mm on the wide end. I've used it before during an outdoor ceremony and reception. When I used the 17-55 I was more frustrated by the lack of reach that it had.
Yes, I would still say the same thing. If you are humble and good at what you do, you're gonna get more business, and they're not all going to be outdoor weddings in nice weather. Even outside, I often find myself in situations where I cannot back up. Like when you are doing family photos and there is a mob of people behind you all trying to get the same picture you are. It happens.
For ceremony shooting, I rarely ever use the 17-55, honestly. Not even the 24-70 or 24-105 is good enough. I'm usually shooting in the 100-200mm range because I want to respect the ceremony and the moment they're sharing. But some shooters are fine with getting right up into people's faces. I'm not. I do not consider the 17-55 a ceremony lens, nor the 24-70 or 24-105. Those are the "everything else" lenses.
Also, I don't think your analogy of the off road truck tires on a civic works very well. The 24-70 is a great lens on a crop body, its just a different focal length than the 17-55. Whether or not its a good focal length is dependent on the style of the shooter right?
And some people like to raise their civics and put big tires on it. Some people like cars that bounce off the ground to the beat of their music, and some like their cars so low they can't run over speedbumps. It's all style. Some styles are just more PRACTICAL than others, and some have more utility than others.
I'm not saying you should follow my style. Not at all! That would be counter-productive. I'm just telling you my experiences. I've owned the 17-55, 24-70L, and 24-105L simultaneously for 4 years. For wedding shooting, I could never find a good reason to use a 24-XX lens over the 17-55 on a crop. In fact, I MUCH preferred the 17-55/crop over 24-70L/FF. The 17-55 is one of the fastest, most accurate focusing lenses I've ever used. The 24-70L is one of the slowest, least accurate focusing lenses I've ever used (I've owned 6 or 7 of them in search for one that was awesome. None were)
More so, what I'm hearing you say is, don't plan to upgrade to the 5d for a few years. Shoot with the 50d, maybe buy another 50d or 7d next year and stick with the crop for a few years. If that was the direction I plan to take, I would consider more seriously the 17-55.
Actually, given the lower price of the 17-55, It's really only an extra couple hundred to get the 17-55 & the 70-200 mk2 vs the 24-70 & 135L. Maybe that is the better route.... hmmmm
Once people truly realize and believe that a crop body is absolutely NOT going to prevent you from producing award winning imagery, the urge to upgrade isn't so dire. There is a current thread where we kinda touch on this topic: https://photography-on-the.net …/showthread.php?t=1003638
If you are going to become a truly amazing photographer, you will achieve that regardless if you are a crop of FF shooter. If you can swing the 70-200, I'd definitely go for that. IMO, there is no better ceremony lens. And honestly, I use the mk1 lens and have absolutely NO desire to pay the extra grand for the mk2. Same reasoning, the mk2 is not gonna make me any better of a photographer. I mean, if the mk1 has produced COUNTLESS cover shots for Vogue, Sports Illustrated, Rolling Stone, etc then can I really say that I truly need the mk2? You will not make any more bookings or sell any more prints because you have an mk2. Clients can't tell a diff. I'd put the extra grand towards lighting and more lenses.

