We have a finite amount of resources on-planet.
Natural resources, sure. Creativity (expressed as both techology and art), however, is infinite.
In other words, even when we've hit carrying capacity (because population growth rates are logistic, not exponential as many seem to think) and we're all using a rationed, subsistence level of material goods, there will still be an ever-increasing supply of new art to consume. Plus, given that advances in technology will continue to make us more efficient, that point is so far in the future that it's not worth considering (except that lack of investment due to deflation might cause us to peak at a lower point, sooner).
Finally, you also need to consider the rate of deflation, vs the yield on reasonably safe investments. If you can make 8% investing vs deflation of 3%, only an idiot would choose to hold the currency instead of the investment.
I made an argument similar to that in another reply. I would argue that a greater-than-3% yield on a reasonably safe investment (where "reasonably safe" would mean "similar risk to a savings account" in this context) would be extremely rare.