Actually Bitcoin and Tulip are completely different thing, it doesn't make sense to compare both of them. Don't compare an apple with a shoes, you need to compare an apple with an apple too. Tulip was expensive because not everyone know Tulip and it's been used for speculation, while Bitcoin, everyone almost know about it, but some people still not want to try to buy Bitcoin.
Bitcoin wouldn't crash and become worthless, if anyone ever predict Bitcoin would worth $0 in the future, it's a people who doesn't anything about Bitcoin.
Dishonest economists compare bitcoin to the tulip mania that happened hundreds of years ago, with this in mind it is important to have some arguments ready in the case someone mentions something like this to you.
So I think the points the OP bring are valid, even if they are very obvious for us we must remember that not every other person is as informed as us about bitcoin, the economy in general and history, so while those economists can easily deceive the average Joe we can always present our case in the case they ask us about this specific topic.