I wouldn't say there is any "internal nature trending more coins to devalue", rather it us a very competitive and growing market and within it are lots of poorly executed projects, which are bound to fail due to huge competition, but if you have a well organized and relevant project, there is no inherent limitation to it's success
You can understand better the devaluation problem size, calculating the rewards worth in new generated coins each 24 hours.
For
BTC today in past 24 hours block rewards generate 1,788+33 BTC ($7,174,734.06 USD), this means a 7 millions USD added each day and 2.5 billion USD per year, a yearly value higher than amount
printed in USD by FED.For
ETH today in past 24 hours block rewards generate 12,692+448.83+29.69+763.25 ETH ($1,868,314.54 USD), this means a 1.8 millions USD added each day and 0.6 billion USD per year.
This calculations show that if tomorrow BTC price reach x10 times the value 40,000 USD, the BTC network will be generating 70 millions USD each day, and 25 billions USD per year. Same for x100 times te price, if BTC price reach 400,000 USD tomorrow, the BTC network will be generating by rewards 700 millions USD each day, and 250 billions USD per year. This calculations show one of the reasons that make the BTC price almost impossible to reach big price values while the block rewards remains high.
This devaluation problem is repeated in most part of the coins an newer projects with smaller communities are more affected.
Could be interesting know projects based in block-chain that solve this devaluation problem attached to the original core design of block-chain.
Anyone know a good stable coin project that effectively solve this problem not affecting the decentralization?