Converting the 737-700 to Max 7's would represent an upgauging since I think the latest iteration of the Max 7 will actually now be a shrunk Max 8, seating about 12 extra seats compared to the 700.

But I do think that US airlines are looking at a slowdown in the travel market for at least a few months or even years as foreign visitors, both tourists and university students, digest the changes in the US political system. If the new administration imposes tariffs on China I can see part of their retaliation taking the form of a curtailment on releasing foreign exchange to support the large number of their students in US universities. I think at last count there are over 1MM foreign students at US universities of which 60% come from just 4 countries: China, India, South Korea and Saudi Arabia. If things are perceived as being less safe for a ''foreign'' looking or sounding person in the USA, I would expect a reduction in the number of the ones studying in the USA. I can see airlines wanting to be a bit cautious about growth plans.