I'd rather have more classes implemented before a level cap raise. Though I understand what you're saying. FFXI's raise in level cap was rather abrupt news and a lot of people thought it destroyed the game because it was brought so long after the cap of 75 was met.
Also note though that Yoshi did say there will be upgrades for relics with level cap raises so I don't necessarily think that it means no level cap raise in the near future. Also for luminary tools the way they are obtained actually encourages a level cap raise, they can make new better tools that are obtained from mining grade 6 and higher nodes with the cap raise.