The node count can be found on this calculator: https://tnt.solutions/

There are currently 8,409 active nodes.

As far as the market ranking, I'd pin lack of tokenomics and a general downturn in the crypto market as the main problems. From a development standpoint, there are multiple GitHub commits daily if you follow Discord. Chainpoint adoption is going quite well from what I understand with continually added business partnerships:

 https://medium.com/tierion/tierion-joins-hyperledger-and-the-linux-foundation-9238e6bbe97
 https://medium.com/tierion/tokensoft-uses-chainpoint-to-improve-compliance-in-token-sales-f4cf2dba5935
 https://medium.com/tierion/signrequest-uses-chainpoint-to-anchor-documents-to-the-bitcoin-blockchain-f3e6fce0db86
 https://medium.com/tierion/evrythngs-blockchain-integration-hub-integrates-chainpoint-to-track-supply-chain-provenance-d9fb56e2f96b
 https://medium.com/tierion/xero-integrates-with-tierion-to-secure-accounting-data-using-chainpoint-5ec6b2a1a5c6)

Tierion as a company is far from failing. The main question is when, if ever, will the success of Chainpoint be correlated to TNT the token. If adoption/correlation occurs, this is a top 25 token imo... but only time will tell.