You lose nothing by getting and staying on the list, so just sit tight and stay positive. Your chances are always better if the item hasn't been released yet, as the majority of cancellations will happen as the orders start to charge. And with Thor and Golden Age Cap, both have moved up significantly in release date so that may catch people off guard money wise and there can be more cancellations there too. You never quite know how many people are in front of you, I got a Midas a month after it released almost immediately after I got on the waitlist because they had more figures and apparently not a single person was left on the list. They also hold onto extra figures for any warranty replacements that might be needed, and if those don't get used they eventually get sold so there is even a chance if you're still on the list a few months after release.
Bottom line, doesn't cost you a thing to get on the list and you can always change your mind before you get charged if one does show up, so don't despair!