Mobile marketing use to be the ‘the next big thing’ only the reality is its already here today and with mobile search set to take over from desktop, it has to be taken seriously now for businesses not get to get left behind.
The answer is it depends on the existing traffic coming to your desktop website now, as if its significant (We would need to look at your Google Analytics account) then there is every chance you would get a real benefit in sales and leads from providing a great user experience, which was not the case previously.