Well I could agree with you in some points, so at least, they could give us the option to choose between old SFX and remastered SPX. Just deleting the old SFX doesn't sound right for a nostalgic like me, and I'm sure I'm not the only one.
Now here's a brilliant idea: having an oldschool mode that allowed you to play it as a simpler GBC/A game. Sort of like the concept used in Halo Anniversary.
Now that would be a real treat for a nostalgia junkie. I would personally cream my pants.
I got a DS specifically for Pokemon SS/HG, but it had a very vague feel of nostalgia behind all the modernization.