Increasing the blocksize should be out of the question, at least until we have exhausted all other possibilities.
We typically only discover new scaling opportunities out of necessity and constraint.
Any increase in blocksize necessarily has an impact on decentralisation (by increasing the cost of running a node).
We cannot gloss over this essential point, by framing a blocksize increase as low hanging fruit, in terms of scaling Bitcoin.
Optional custodial solutions on layer 3 are better than mandatory custodial solutions on layer 1.