It's entirely up to you! You and only you are in charge of yourself! Are you ready to make a change? WW is one way to lose weight, but if you're not committed, like any other food plan, WW online will not work.
I follow WW using eTools and have all of the books here at home, so I have access to all aspects of program. And for me, there is no going-off or going-on program. I had too many "last suppers" in my years of WW. It is truly a lifetime project for me. Losing/maintaining are both tough. But so is being fat.

It's all about how you want to live.
My best to you and I know you will make the right decision!
Judy