Decide for sure that you want a divorce.
Then, you have two options (unless the new law becomes final but thats another beast): Desertion or cruelty.
Desertion is the best option because it is easy to prove. Cruelty is difficult to prove, especially against a woman. However, the filing of 498 and DV cases by her will help you as these can be grounds for cruelty against you, if you prevail in them and prove that they were filed frivolously. Retain all evidence of threats.
So... keep trying to write to her to come back, legal notice, etc. not for a first-strike advantage but to get evidentiary trail that you were always trying to get her back and she has deserted you.
Pray that she files DV and 498a cases! -:) Win!!
Let two years pass by for your separation. Then file divorce based upon desertion.
In the mean time, or later, when DV and 498a goes against her, amend the divorce petition to seek divorce on cruelty also.
PLAN, STRATEGIZE AND WORK TOWARDS THEM WITH THE END-GOAL IN MIND. DO NOT DISCLOSE YOUR STRATEGY WITH ADVOCATES. JUST MAKE SURE THAT STEPS ARE TAKEN IN THE RIGHT DIRECTION.
If you win on desertion by her or cruelty by her as basis for divorce, it will be difficult for her to qualify for maintenance.
My advice is based on the assumption that your wife is at fault here.
GOOD LUCK!