firstly there is no such thing as quasi centralised... its either centralised (one point of failure) or decentralised.
there is however wildly distributed or confined distribution, which if the distribution of LN nodes is confined, it could possibly lead to collusion..

i personally dont see it as a ripple thing.. where everyone needs to log into a ripple owned server. to then trade with coinbase or bitstamp
i see it as a standalone executable that anyone can have. but where most of the big players such as bitpay, coinbase, etc will be the main channel operators, purely due to popularity of moving funds in and out of their services.

and as long as this executable still uses the same signature method and proof of value to ensure even they cant fiddle with other peoples funds then its all good.
if it turns out to just be a sql database saying | user1=0.1btc | user2=0.09btc | where the channel operator can fiddle.. then it should not be part of the bitcoin ecosystem