Yeah, we don’t really know. In 2016 CCP Quant told us that there was 3 Quadrillion ISK worth of assets in the game on active accounts. That means, at current destruction rate of 1T a day, it would take 3 000 days, or over 8 years to deplete New Eden of player assets if production stopped completely (and destruction stayed constant). Of course, production hasn’t stopped, and if we ignore assets lost to players leaving the game (which we shouldn’t) we add another 2 days to that number every day that passes.
Perhaps you will find that presentation interesting:
Looking historic production vs. destruction, I don’t think production and destruction are especially well balanced, and since the capital ship rebalance, the rate of asset accumulation by the players has doubled. This is offset somewhat by the fact there are more expensive new toys to build, but we are all far richer than we were even just a few years ago, which I guess is good in some ways, but is bad in others, including for the reason articulated by the OP. We have almost no scarcity, for anything anymore, and very little reason to fight for anything other than fun or honour. For some players that is their ideal version of Eve - one where losses really don’t matter, while for others this erodes the competitive and economic game that they came looking for.
Personally, I think this excess wealth is much more detrimental to the long term health of the game than most realize. So many players play the game to gather and build things to sell to the war machines, and literally their reason to play is diminished every day New Eden stockpiles more weapons than they use. I’ll grant we don’t have all the numbers to conclude that, and loss of ISK/assets to players quitting is a potent feedback loop also underestimated by most, but I consider it plausible that someday there will be an economic reckoning for this period of excess production that will start the real exodus of players from the game.