The good thing with an emission schedule is that you know it in advance. You decide to buy it or not, but you don't change it just like that. It's part of the social contract supporting the coin.
I don't entirely think it is quite that simple. You can decide to buy because of great advantages but despite problems with the emission schedule. You don't really get to choose between every possible variation.
The "social contract" emissions curve argument is a precedent that comes from Bitcoin and I don't really think it has done Bitcoin any favors. For example, the commitment to the insane notion of rewards going away and mining supported by transaction fees despite no cogent argument about how this is going to work has become something akin to a slow suicide pact. There may be other problems too (my suspicion is that Bitcoin's is too fast). Contracts, including social contracts, can and should be renegotiated when new information presents and conditions change.
I totally and completely reject the "cut emissions because we want less dumping" suggestion though. That is not a valid or useful reason to renegotiate a social contract.
Let's wrap this up though, unless someone can tie it directly in with speculation. Any further discussion should be on the main thread.