I answered above to another poster about the health, the cards has been tested and there are plenty of counters. Re the older cards, that point has nothing to do with Modern cards, the old cards are not playable in Modern.
All assets from cards, to SPS/DEC, to land are part of a large economy. There is no magical formula to deploy that makes those assets go up. Its simply a case where we have more sellers of assets than buyers of assets. Some people come in a downtalk things every day and somehow think that will help to change things, but in reality all it does is create more doubt and uncertainty which then makes other people not want to put money into this.
The bottom line is we either create more demand for our assets than we have sellers or we don't. The people buying think the people selling are wrong, and the people selling think the people the people buying are wrong. In the end it will work out how its supposed to work out.