Your prediction of always increasing demand can only become true if the transactions stay cheap and fast. Otherwise volume and thus demand will imo decrease as people, especially those sending small amounts, will choose faster and cheaper alternatives.
With the idea of Bitcoin ever increasing simply defeats the idea of cheap transaction. Just imagine if we have a fix 10k satoshi fee and Bitcoin reach $100k dollar then we will have 10 dollar worth of Bitcoin for the transaction. And it goes with the higher fee when Bitcoin increases. Definitely developer would have to fix this issue too.
I agree that bitcoin at this point in time has a really bright future but i am slightly worried about the scaling issue. i hope that can get sorted soon and we dont end up dragging it out for years on end. I really hope that both parties have bitcoins best interest at heart and dont proceed in anyway that would damage bitcoin reputation.
Definitely scaling will be fixed soon, we just need to have patience on this.