I actually had an idea for a replacement system.
Basically, instead of having a series of talents, players will gain access to Talent Runes as they level. Talent Runes can be bought from your class trainer as you level, and can be equipped similarly to glyphs. Under this new system, the line between specs will be blurred somewhat as previous spec-exclusive abilities become class-wide, e.g. Prot paladins will be able to use Divine Storm, etc.
Of course, there will be some abilities that will remain spec-exclusive, such as Templar's Verdict or Raging Blow, and not all abilities would require Talent Runes; all death knights would have access to Icy Touch and Plague Strike for instance. Let's not forget passive abilities, either. *cough Divine Purpose being baseline for Retribution cough*
Speaking of glyphs, this new system could open up a ton of new glyph possibilities. The idea that I had was that each ability could have a minor glyph and a major glyph attached to it, so if a hunter decided to pick up Explosive Shot, he could in theory get a major glyph that adds an additional tick and a minor glyph that changed the animation, or he could pick up a major glyph that caused it to only hit once, but also inflict AoE damage.
... Hey, it's an idea. Shut up.