Todd, I think that you'll find that the MFT will still be a part of your workflow regardless of slider size, both because you are used to it, and because having that track makes for some easy operations that might be more cumbersome on the slider, even though it's a slider. Example...routing dados/grooves across narrow workpieces that have some length to them. I don't use my MFT very often, but I'm glad I have it. I actually did try to use it as my "primary" saw solution in the temporary gara-shop while waiting for my new shop to be built and it didn't cut it, pardon the expression. Some of that was just my own work habits and some of it was because it was difficult to work with very small workpieces. I ended up getting a cut down cabinet saw to use until I could get back to a slider in the new shop.
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The most expensive tool is the one you buy "cheaply" and often...