Question 1: My status stayed the same from 2013-2014 to 2014-2015, but I've also been splitting my status:

2006-2007 NW Platinum
2007-2008 NW Platinum | US CP
2007-2008 DL Platinum | US CP
2008-2009 DL Platinum | US CP
2009-2010 DL Platinum | US Platinum | AF Club 2000
2010-2011 DL Platinum | US Platinum | AF Club 2000
2011-2012 DL Platinum | UA Premier Executive (matched) | AF Club 2000
2012-2013 DL Platinum | UA Premier 1K | AM Platino (matched)
2013-2014 UA Premier 1K | AM Platino | AS MVPG
2014-2015 UA Premier 1K | AF Club 2000

Question 2: My spend largely remained the same as I'm a predominately leisure traveler on UA, since the company that I work for requires me to use AF/KL or other carriers within in SkyTeam by extension. But, expounding on leisure travel, I tend to fly in discounted C (P fares, of which the P fare sale last year helped immensely) or pick routes that have R availability at time of booking to secure the upgrade.

Question 3: Nope, especially when UA had the P fare sale, which assisted in getting me the necessary PQDs...I just ran out of available weekends to travel though.