Given Google's history, is there any good reason to believe this service would still be supported by Google in a few years and not be replaced by yet another new-and-of-course-much-better-than-the-old-one iteration?
In the case of Google Cloud Platform products, many of them [1] are subject to the deprecation policy [2]. Basically it states that they'll give you one year advance notice of any intent to deprecate those products. This is functionally the exact same policy as that offered by AWS [3].
[1] https://cloud.google.com/terms/deprecation
[2] https://cloud.google.com/terms/ (see Section 7)
Rather, they seem to double down on all of them.
I guess you could say this is the replacement for Cloud Storage FUSE [1], but it's not and if it were I don't see the problem with that.