Monetary velocity increasing implies a greater worth per unit as the currency becomes more circulated and so held. Incidental holdings count far more then deliberate speculation as some people will effectively hold forever, the trend across millions of people is the real fundamental worth rather then the market bid of an asset that does not actually have a use for it on a balance sheet. I'm only going to be impressed by anything Tesla does if they do put the BTC they have taken on into working circulation and increases effective population of the blockchain then we have actual gains likely, increased demand even if its circulatory is a big deal. Regular demand does equate to lower volatility I think.
Do not forget the ones that are lost as well. I am not sure if this is true and it could be a big lie but I read in many places that there are 1 million coins just satoshi had that is forever gone now, and even if that is not a fact and just plain wrong, we can safely assume that there are too many bitcoins gone for one reason or another.
We talk about 21 million bitcoins ever available but that is quite wrong, I am pretty sure over a million is already gone and can't be gotten ever again, people being dead, sending to 0x00 addresses (well whatever it is in bitcoin world) and many other things which means that bitcoin doesn't even have that much. Put the "forever hodling" people on top of that and you got yourself probably less than 10 million bitcoins ever in circulation and most of them are even long term as well, even though they are not holding forever, they are not selling daily neither, which leaves only a few million bitcoins ever traded daily, probably closer to a million.
This is the proof that bitcoin goes up in long term because more people that buys and holds, means less bitcoins available to trade.