Investment in XRP is also risk, SEC is ruling over it.
The case was done and XRP won over it.
If Elon stop supporting Doge, it will turned out to be meme project again. All new coins are not risk, proper research needed before investment.
I don't think that he'll stop supporting it. But he'll continue to troll and play with it through Twitter account. He's loving the attention that's given to him and that's why we might never see him stop doing so. He's earning from it as well and that's why he understands that if he ever need some few chunks of profit like a couple of hundred thousands, he'll just need to talk about it and just do one tweet over it and then the increase will be visible so quick.