Anything that inspires you to play more - a new guitar, new strings, a new box, will ultimately help you get better. As we all know - practice is what counts - and if the AX8 makes practice easier, more fun, and just drives you to play, then yes, it can help you get better.
The trick is to spend those extra hours as productively as possible. Running the same old scales over the same old progressions will only get you so far. As the saying goes, there is a difference between 10,000 hours of experience and having the same 1 hour experience 10,000 times.