Speculation is not what Bitcoin now desperately needs. It needs real life adoption and there it sucks massively, sorry for that.
Speculation is an aspect of any market, so whether we like it or not, it will always play an important role. I however agree that we need more adoption in form of actual usage, but the thing is that Bitcoin at this point doesn't really stimulate that as you (in a less subtile form) also pointed out. No need to say sorry, it's just your way of expressing.
And I don't think that LN is likely going to mend matters here because it won't affect volatility. It is volatility due to Bitcoin's speculative nature that prevents it from being used as a payment method.
It will matter, and in a significant manner as well. It actually surprises me that you don't see that. Currently the next few aspects are what bothers people, and at the same time prevents Bitcoin from becoming a mainstream phenomenon that it deserves to be.
1) high transaction fees.
2) slow confirmation times.
3) low number of transactions that it can process per second.
LN tackles all above annoyances that people 'suffer' from in today's market, and will stimulate people to transact with each other far more than we can imagine right now. In other words, LN is a major adotion booster, that's a fact. Regarding using it as payment to purchase goods and whatnot, I more or less agree that it won't change very much in that aspect. It has partly to do with the volatility, but the main point is that people don't want to spend something that can jump up significantly in value the next day. That's something we have been dealing with for years now.