Doug,
The Mamiya 7 has some of the best lenses ever made. In fact you would be hard pressed to beat the quality except with MF digital backs. Perhaps the Eos !DSIII would trounce it but I'm not sure.
The G2 is such a gem. I'd hope you at least kept that as it is small and it provides an alternative way of getting high quality images. What lenses do you have and when did you last use it! Hmmmmm!
I too am guilty too of neglecting my film cameras. However I have made a major investment in cameras and lens to do 4x5 and 8x10 film photography as well as pinhole photography. My enthusiasm for digital is undiminished. All my constructed tableau's are made with 3-10 digital images of posed actors. For tat digital is fine.
For me, film is for character, landscapes, cityscapes, concerts and ballet dancers and especially natural light.
I would not worry too much about film availablility. It is still used enough for a market to exist. The choices will shrink but all niches with film photographers will be covered. There is, BTW, an effort to get Polaroid film, at least in the large rolls, made again. For now, I'm not worried. Besides, B&W film stored in your freezer will be good in 10 years time. I have used 10 year old color film with no problems!
Asher