We're 10 years into a bull market. Suppose you apply now, that means you start September 2019 and graduate May 2021. No one knows how the economy will be, but i'd be pretty worried about graduating deep in the trough of a recession.
This reasoning is sound. If one felt an MBA was worth it, probably better to try for a part-time MBA while keeping their current job. The only disadvantage is that many have said the networking and career opportunities are slightly better for full-time MBAs if students wish to shift their careers completely into different sectors.
I would say that knowing exactly what one wants from an MBA program, financial situation and risk tolerance, will usually tip the scales in favour of a part-time MBA.