Should it be 'might' instead and what is the reason?

[Kohyoongliat]

After consideration, he decided to go ahead of his plan, no matter what major obstacles may appear.

Should it be ‘might’ instead and what is the reason?

Thanks.

[Anglophile]

I think it should be might which is in tune with decided.

[Alan]

The use of ‘may’ is not incorrect here. By using this verb form you are opening up the situation to what is happening now or is possibly going to happen.

[Andrea]

I agree with Alan. It should stay as it is.