I reserved judgement to complete 3 full days of digging to get an accurate sense of the changes and I'm quite disappointed. I've come to the conclusion that, when factoring in costs for the Mk-II blue enhancers, digging is now a actually a credit sink. The only reason to do it now is to obtain the gear sets and/or speeder parts.
I got my last needed part today. No more digging for me.
Perhaps they did this to clear out the dig sites for new players? Just speculation, but it is the only reason I can come up with that makes any sense at all.