FPGA enhanced emulation is still emulation, though I can certainly agree that when FPGAs get that little bit more beefy and can sit in my PCIe slot to be used by emulators as an alternative to the "that'll do" of pure software emulation that it will be a good day. I can appreciate some people wanting a pixel exact recreation, that is very much not me though if I can instead have a nicer experience. I would also very strongly argue otherwise on percentages wanting pixel exact, percentages wanting a game that plays more or less as it would have (probably the bulk -- see also all the emulation collections/wiiware/andrios "ports"....) and those that would like to what went originally and spice it up some.
Full enhancements, save perhaps stuff like the lua addons for some games, I can see not appealing so much for 16 bit/2d era stuff, early 3d so very much wants enhancements though -- even if they do not know the words to describe the things they are seeing most will tell me the N64/PS1/saturn games look like arse if they are versed in more modern 3d. I probably would not do it to the exclusion of a "go stock" mode but the lack of textures, quality textures, lack of AA, low framerates.... stuff that can all be reasonably fixed with simple to use emulators, I would hold to be a very serious part of any appeal these things can have though. Mind you I have no particular love for what a lot of people playing in the console texture hacking/replacement world are currently doing, though I fear that might be the half backwards way they set about a lot of things I would otherwise do in ROM hacking.
