I agree your ideas on getting back into the gym. The concept reminds me of when I was well overweight and had to change my diet to start dropping weight. Initially I had a lot of questions, but what I eventually realized was that the only way I was going to get results is if I actually took the knowledge that I did have and actually DO IT and put it to use. Its interesting to note that in the end, I eventually realized that (putting aside satiety issues and athletic performance) cutting calories was the only thing that mattered when it came to dropping the fat. Thats the golden rule that will never change.
Aside from that, when it came to adherence, there was also one big lesson that I learned when I was in college, and it kept coming back up time over and over again in my life. That is, just about anything is better than nothing, and therefore the best routine you can do is the one that you can adhere to. As an example, if I was working 60+ hours per week, I'd probably only workout once per week. I actually did that earlier this year to get in the best shape I've been in over a decade. With compound movements and rest pause sets, you really can make a workout brutal enough to make it affective enough to stay strong while dieting. The rest I took care of with diet.
Now I'm not saying that one workout per week is the best. But the point is that if it can be effective, and it is, one should never have an excuse for not training at all. Arthur Saxon was the strongest man in the world about a century ago, and he used to only workout twice per week when at his strongest. I've also known world class powerlifters that only workout twice per week. So there really should be no excuse. Keep your workouts simple and hard, 1-3 weight sessions per week should be plenty (depending on your schedule), I suppose unless you want to be a pro bodybuilder, and let the diet take care of the rest.
So in summary: Don't ever quit. If your schedule gets in the way, just make the right adjustments to your workout as necessary, even if that means reducing total time in the gym.
As a side note, I also learned a good lesson this year. Physical activity is good for you. It makes you happy, makes you feel good, reduces stress, and moderate intensity activity even helps your immune system. So if you're spending less time in the gym for what ever reason, hopefully you'll still be doing something out of the gym such as working or playing, or even a nice walk, anything physical.
My additional notes on diet are as follows:
Just like with workouts, keep it simple. Want to see those abs? Eat less and the fat will come off. Simple as that. Knowing and applying that and you'll keep the fat off for life. I promise.