There's no problem whatsoever.
What I find strange is in this present economic climate that Sigma are still charging only £33 per per lens to rechip their older lenses. That's the same amount as I paid in 2002.
So in answer to the last part of your question, I have put old lenses on my Canon cameras and I know of several others who have done the same.
All EOS lenses should work without problem regardless of their age