it would imply that it is not possible to use a block size limit to drive up fees.
There are three limitations that play against each other in the considerations above.
1) The limit on block size in any particular system.
2) The network effect of the first mover serving as a limit incurring costs to switch.
3) The limit on bandwidth in home networks defining the playing field.
Bitcoin can leverage its first mover advantage in order to play it safe with regards to its limit on block size as the cost to switch would be the highest, but other systems would need to stay within the confines of the home networks in order to provide the same core value proposition to compete with Bitcoin properly.
That's why Bitcoin only needs to move when any other similar system begins to approach its effective transaction volume while running on home networks.