So this seems simple at first, but hear me out.
The devs have already said that they want to deal with button bloat, trimming off abilities where possible. MAny of the new talents actually replace or upgrade existing abilities rather than adding entirely new ones, or are passive.
The question is, how many more talents can we expect before there are too many? If we get a new set every expansion, in a few expansions time it could get out of hand. They won't be able to add in as many new abilities, and you can only rework existing ones so much.
Do you guys think they'll continue adding more every expansion regardless, or alternative systems? Perhaps reworking glyphs or something.