I just want to put my two Bobs worth in.
When I worked for a newspaper, we were issued with 1D MkII and 20D with grip as back ups. Over a time (and I wasn't the only photographer), the 20D became my work horse. Fantastic image quality (for the time) and much much lighter than the 1D. This is very noticeable when you have a camera in your hands for six hours (or more) in a day.
2005 I planned to go tripping around SE Asia (my second trip) and had planned to take my work issued 20D with me. My boss wouldn't allow any gear to leave the country, so I bought a 350D, grip and Sigma 18-200mm. This kit worked out well. I got the shots I wanted, and was light and compact.
Moving to SE Asia to live and work, I bought a second hand 20D which I still have. Then later a 50D and gave my 350D to my daughter which still produces fine images.
Late last year, I bought a 700D the 18-55 kit lens (which I've hardly used). My 18-135 STM I bought for videos on my EOS M, now accompanies my 40mm f/2.8 when shooting with the 700D.
Where I'm heading with this is, over time I have scaled down my gear from 1D MkII to 20D to 50D to 700D, and I don't miss a thing. I'm getting more and more into video these days and the 700D is perfect for this. I still have the gear listed in my signature but my 700D has become my main camera now, although my S95 is usually always with me.
My 50D produces outstanding images. I love the way it handles. Once the 700D is in my hands, it doesn't take me long too get accustomed to the functions and handling. The upside is, the 700D produces images at high ISO (which I shoot all too often) much better than the 50D. My poor old 20D has hardly seen the light of day these last four months.
I'm now using my 700D/40mm f/2.8 for street candids. I just stick it in my small messenger bag. Easy to carry and discrete, and produces some fine images.
Back to the OP, stick with the T5i for awhile. Get used to it, shoot as much as you can and in time your buyer's remorse will disappear. Later on, you can always update as new models become available.