Here's Mac's statement on Threshold's official chatforum at Ultimatemetal:
Mac's Statement Sorry it took so long to give this statement. But, I'm also sorry it took me so long to realise I had to get on with the rest of my life and eventually make a decent living. I know the timing was bad and I'm very grateful to Damian for standing in for me. Unfortunately it's absolutely impossible to live on fresh air alone. Next time you listen to a Threshold album picture my girlfriend having to work overtime to make it possible for me to go on tour, not to mention all the jobs I chose to give up to continue with Threshold. Once again, the timing was bad.... I was up all Friday night (13.07.2007) considering this and decided it was time to support my family 100%. For all the Fans out there take what you have and enjoy it (I know I was devastated when Led Zeppelin came to an end). Thanks for all your support, all the best for Threshold and Threshold Fans for the future, Cheers Mac.
This is actually very much the impression I had.
He has been criticized by many for his timing, informing the Threshold guys of his decision to leave the band few days before a major tour.
Fortunately Damian could take over.
Did any Roomie experience a concert on this tour ? (answer in the Threshold thread)

Nicky.