You are right, it is an interesting theory. However, it is not a true science. Geologist, paleotoligst ... ok all the main stream and even side stream -ologists consider the idea a psuedo science. Many of the folks that support the idea of 'the Earth is growing' hypothesis also support the Hollow Earth theory. Check that one out if you really want a headache.
Now it is possible that the earth expands and thereby gets "bigger" and technically if there is more activity along spreading plate boundaries than the conductive/slip boundaries - the earth (lower case) will get "bigger," for a time. Then pressure builds, plates slip/slide (oh yeah big earthquakes) and a state of balance is restored - or at least the pressure has reduced.
Yes folks are going to balk at the current geology models - remember they are really fairly new models also (less than 100 years in some cases). But the issue I have is that the evidence Mr. Adams is using doesn't actually support his model well.
...my hubby is laughing at me... he says I haven't been this worked up since I was in my Master's program. I told him that was his fault