While Venus-Kethu dasa period is not going to be that bright, the next Sun Mahadasa will be much better than Venus Mahadasa where you will do much better with your career with a first class success factor with possibly a change in work place too.
Not at all. Mercury lord of 7th though is in 2nd house with Sun is not combust since Mercury is 11 degrees away from Sun. So there will be no problems in the marital front. And your 7th house is reasonably strong.