I haven't read much Wilber, but that kind of Boomer co-opting of transpersonal psychology and Eastern philosophy is quite consistent with the critique I'm putting forward here. In the 1960s, the Boomers recognized the clash between Axial Age religions and American consumerism/imperialism, so they attempted to reconcile them with New Age postmodernism. That's how liberal Christianity works, so it's a question of which side wins out in the synthesis, Jesus's counterculture or modernity (commercialism, hedonism, neoliberalism, naturalism, etc).

Sure, then, liberal Christians could consume Wilber's system, too, cherry picking it and adding those parts to their convenient interpretation of Christianity, to sell the latter to a modern audience.