I hope there's still some spots available by the time bitcoin falls to $3.66, because I'd sign up at that price point. Its worth two subcriptions at $1.10. I don't think it will, but if it goes below $4, I'll pay.
1 BTC is 1 BTC. And I humbly predict: it will still be 1 BTC in the future.
In other words: I don't quite understand your thinking, unless maybe, you have no Bitcoins at all. Because if you do, that service will be no less expensive for you in the future than it is now. 5 BTC is 5 BTC.
I don't collect bitcoins for fun, as they have no inherent value to me. I trade them for profit, so my thinking is that they're worth whatever I can sell them for at some point in the future.
If their price goes down in the near future, 5 BTC will be less expensive since they could be replaced for a cheaper price. Or, the same 5 BTC bought cheaper earns more profit for the speculator. Hate the game, not the player.