I don't think crypto bubble will resemble the previous 2000 stock market bubble or the real estate, there will be many many road blocks by the governments if it gets too big and that will be overnight. Plus the security issue is huge, you put all the money on exchanges where non of them are regulated or insured. If someone gets into their server and steals the wallets there will be billions lost, don't see it happening. I think it will be slow growth because of the technical aspects involved with crypto.
sorry for the grammatical errors, I am sure there are many

Oh, your concerns are completely valid and there are many more. Regardless the opportunity to trade is here in our face. Play it smart and fast. I don't keep any of my coins idle on a market unless I am sitting in front of it or it happened to be a bad sell order. I lose on tx fees but I would rather lose that than an entire wallets worth.
I like doge. I didn't at first but I see value in it. Regardless of face value