It´s not about anyone need to run a node. It´s about anyone CAN run a node. 
That´s the major achievement of BTC. Noone needs to trust anyone. Sure you can if you want to. 
It is important EVERYONE has the choice.
Increasing the block size, adds the possibility that this concept fails. 
That´s why I don´t want the block size to increase. 

I don´t say we have the perfect 2nd layer for now. 
But I know I don´t want to add the requirement for trust to the main layer.