As miners get close to the maximum volume of bitcoin, their reward gets smaller. But even though given that fact, we are still considered close to maximum, and demands would start to rise. The price would continue to rise as deflation would occur, which is I'm not really sure if it would be good or bad to the future of bitcoin. If it's value goes too high, then people will just hoard and bitcoin exchange would slow down. If no one wants to use it, then that could impose threat to bitcoin in the future.
this is just armchair speculation. In the real world, people do use both inflation and deflation to their advantage, but there are also many other different pressures on their decision making all the time.
If you have Bitcoin, but want a better lifestyle, big jumps in exchange value will always cause you to consider spending some on whatever you've been coveting.
If you keep Bitcoin for a lifetime, and have resisted
all temptation to lifestyle upgrades before retiring, then there's a good chance you will change your attitude, as you are more aware than ever that you're
dying 
It seems to me that the whole "Bitcoin stops spending argument" is just a very negative way of saying that Bitcoin makes you choose your purchases super carefully. Oh no, Bitcoin will stop people spending their money on crappy products that stop working or break after 2 years, how terrible that's gonna be! People want to save BTC more than they want to spend it, what a stupid thing to do, huh?
Do you work for a pension company, or some low-cost household goods manufacturer? Sounds like it, because those businesses have alot to lose from everyone switching to buying quality products or investing in good assets for their old age
