It appears to me that sidechains can be used for this purpose. If bitcoin nodes can be equipped in a way so that it can perform as a gateway between bitcoin blockchain and an altcoin blockchain, i.e. validating the altcoin blockchain with bitcoin network with every bitcoin block found, then this concept might work. These nodes will be super node for the altcoin network, but normal for bitcoin network. Those altcoin blockchain or sidechains may incentivize the nodes, like it happen in PoS and in return can be secured by the huge hashing power of the bitcoin network. The altcoins, secured by the bitcoin network, may also help to solve the ~10 minutes delay of bitcoin confirmation.
As I am not an expert of the sidechain technology, I'd like to know from people with knowledge, whether an altcoin blockchain can be pegged to a bitcoin blockchain using a common node ?
1. "nodes" are just people using the official bitcoin-core program. nothing more nothing less.. nothing special about it..
2. your plan is to ask people to not only run bitcoin core.. but also have other blockchains of altcoins on their computer at the same time.
3. you still havnt told us what solution you have for the reason people dont want to run bitcoin core ( hard drive bloat) instead you have proposed more data storage bloat by saying people should have more blockchains stored on hard drives..