Most bitcoiners would agree that it is desirable for Bitcoin's decentralization that we have users running their own Bitcoin full nodes and, now with advances of second layer solutions, to run their own Lightning Network nodes. Today a normal person can open LN channels and be a node operator, which is very good because the LN protocol is decentralized and we can reach more autonomy running our own nodes.

One of my concerns is that fees on the Bitcoin network could become very high and that it would be very costly for normal users to run their own LN nodes since to open channels it requires an on-chain transaction. Moreover, if the fees are too high then it would increase potential risk of malicious attackers in a disputed close because a "justice transaction" is an on-chain transaction, which can be costly for the honest party trying to legitimately reclaim the funds in a disputed close. This could make LN and other layer 2 solutions quite centralized in the future since normal users wouldn`t be able to have their nodes...

Is this really a plausible concern for the next years/decades? How could that problem be mitigated?