No, not at all, Aeroplan has the most airline partners and my most travel airlines are SingaporeAir, Eva Air, United, Emirates and Qantas.Are you worried about being trapped with Aeroplan points only? Lack of flexibility and etc.
With Aeroplan points I can redeem for these airlines except Qantas (I have Qantas cards, so no worries), for Emirates Flights redemption, I always use Aeroplan points for less points and much cheaper tax than using Qantas points.
and if I feel I am trapped with Aeroplan points, I can always use the Pay Yourself Back feature on this card, which I can redeem 1 point for 1.25 cents on travel purchases.