gareth emery does play a broad music spectrum, from progressive, tech to peaktime trance, but i have to agree, he does play the same tunes week in week out i have to agree
the only people i could see, or who id want to see on radio 1, would be above & beyond
on the basis of 2 reasons, popularity & also 1 member of them is always available to host the show live.
gareth emery for example is quite a globe trotting dj, and most shows would be pre-recorded, where as above & beyond only ever dj live as a duo, not all 3 members meaning 1 of them could do a live show, i.e the member that stays at home.
However they have a big fan base with the syndicated trance around the world shows, so possibly could rule them out?
Andi durrant has been mentioned as the replacement, but he's not big household name, but has a big fan base on the galaxy network
i recently twitered him with the link to matt hardwick forum, asking if he's moving to bbc radio1, got this reply which you can read into how you want:
" @dj_iank Wow.. that's a lot of speculation! Obviously whether it's true or entirely wrong I couldn't comment on twitter though "