That it hasn't been done on a large scale seems to indicate there isn't a market for a 2x2 motorcycle.
It's not brand new.
From the Christini website:
1995: AWD Mountain bike concept envisioned and first prototype was tested
1998: AWD concept was further developed and tested showing the feasibility on AWD Mountain Bikes and the potential for AWD Motorcycle
1999: Christini Technologies, Inc. is established, tested, and manufactured based on original prototypes and international patents
2001: CHRISTINI sells the first production AWD Mountain Bike
2001: AWD bicycle technology was licensed to Jeep Bicycles for mass production
2002: First AWD motorcycle was designed , built and tested
2004: First Magazine testing done in California
2007: First consumer CHRISTINI AWD Motorcycle sold
2008: CHRISTINI upgraded KTM motorcycle competed in the inaugural Extreme Enduro Race placing 2ndestablishing the AWD technology as a viable and competitive on the worldwide where to purchase lexapro racing stage
2009: First road tests on CHRISTINI AWD motorcycles conducted – road lap times proven to be faster with CHRISTINI AWD technology than traditional signal wheel drive motorcycles
2010: US Military tests conducted with exceptional results.
2011: US Military adapts the CHRISTINI AWD platform for use in worldwide operations
2011: CHRISTINI races in the inaugural Enduro X at X games 17 with two of the top 20 riders
2011: US Border Patrol adapts the CHRISTINI AWD platform for operations
2011: CHRISTINI launches its branded line of motorcycles for worldwide distribution
2013: CHRISTINI completes it’s first full year of production motorcycles
2015: CHRISTINI receives California Air Resource Board approval for the AWD 450DS motorcycle