Nobody uses Bitcoin as a currency to buy stuff, everybody is holding and in for a profit,
Speak for yourself.
And I seriously doubt that you have ever even invested in bitcoin or get anything apart from your signature spam payment.
I agree. I use bitcoin quite a lot. So the transaction speed is important.
I am the living proof that there are people out there who actually buy things with bitcoins.
And it is really necessary to keep bitcoin used as a way of payment.
All that infrastructure that has been built the last years would vanish if nobody uses it.
That would decrease the demand for bitcoin, because I do not think that pure buying for holding can compensate it.
A decreased demand means a lower price.