That's very true, although they do appear to be getting new fans through reaction videos on YouTube.
Although I love Tubular Bells, I will admit it is not in my top 5 of Mike's albums, and also, probably not the greatest album to introduce someone new to his music, the intro aside, I would suggest his 3rd album, Ommadawn, and interestingly, Tubular Bells 2 from 1992 which is my favourite album of the 3 Tubular albums, and the most accessible one too. The period from 1990 - 1996 was an incredible time musically for Mike.