No you said ANY MBP. I boldfaced it to make the point. If you had said cMBP you would've been correct.
OK, you're right. (Nevertheless, the Surface has only been compared to the Air in this #, not to the significantly heavier rMBP's.)
EDIT after doing some checking myself (setting up boot camp) you are correct on your other point.
EDIT2: you're going to be waiting for a very long time for that new 17".
I find the single SSD and lack of optical drive absolutely fine with my rMBP. Whilst it is being used outside of my home network I restrict myself to the project I am currently working on, and at home have everything available from NAS.
I need to access my 1TB media files everywhere I take my 17" MBP to. Doing this would be very cumbersome with any external drive, let it be a portable 2.5" unit or a NAS. This is why I prefer dual-spin MB's.
A 4k screen? Why? No other screen in the Apple range is anywhere near that. Nor do I believe there is any commonly available 4k screen at a reasonable price.
1, 4K would be the Retina version of the Full HD 17" screens of the previous 17" MBP's. For development and video editing, I prefer using the internal screen (no need to have multiple hi-res, hi-quality monitors, quality external keyboards etc. everywhere I go - particularly not in my summer riverside cottage, where I have to mainly operate on battery power), where screen estate does count. I couldn't work on a smaller screen with as high efficiency as on a Full HD-equivalent one.
2, Yup, I know 4K screens are (still) pretty expensive. Nevertheless, they will surely go down in price. Too bad Apple dropped the 17" line...