still if u have premier - that has different purpose where u need reward points to transfer various partners. those reward points can only be accumulated if u combine spends cumulatively, if you split here and there then sufficient reward points never be fulfilled to transfer or enjoy the benefits. When it comes to super-premium cards, its always less is better compared to diversification.
Moreover, if you have premier range of salary, then I believe they can waive the annual fee for 1 or 2 years easily. Remaining will think when time comes and this card still survive at that time. For now, take it and enjoy as much -- if you still want it and ok to delay premier (or any other super-premium card with you) reward redemption.