Please disregard the tone, am trying to catch up and you know I'm a pussycat in real life and eLife. Suggesting the idea that Writer's Block is a mythological beast is not popular around here but that's what I am suggesting.
A professional (which is what most of us aspire too - apart from Marc who is 
) can't foster the idea of writer's block. If there's a looming deadline and a blank page, our dream job won't last long. Being a professional writer isn't about having the luck of avoiding a dry spell before a deadline, it's about writing what's required to demand, whether we feel in the groove or not.
There are ways and means to get through dry periods. As writers, we need to be identifying and developing those techniques NOW because if we make it, we'll certainly need them.
Paradoxically and luckily for us, writing isn't all about writing. Most of the work is in the planning stage. Whenever I've hit a block in the first draft it's nearly always, on analysis, been because the planning was incomplete, or I failed to grasp or muddied the key concept. When I put the groundwork in first; the scenes, the characters needed for those scenes, and the essential dialogue fall into place.
I've been (possibly still ongoing) through the longest and darkest period of my writing life BUT I still write every day, no matter how small or weak the result. I can always edit or delete at a later date. If I have to, I sit for hours until I have something. It's partly the setting (my bedroom PC) and the physical action of tapping at keys. If that doesn't do it, I lie in the bath with pencil and paper. Or walk with pen and paper. Or call SlagB - writing partners are great cures for those dry days.
As to running out of ideas - the ideas you write were never floating in the ether, waiting for a muse to throw them at you, they were already in your head. The key is not "Will I ever have another good idea?" but "How do I unlock the ideas that are already there, in my subconscious?"
Again there are techniques for getting at those ideas and stories. You have to find the methods that work for you, personally. You may not feel particularly inspired and enthusiatic as you haul them out of your cranium but that's the nature of a job, it's unpleasant and (sometimes) painfull but it pays the bills.
So to the original poster: Shake the tree hard enough, long enough, in the right way, and the coconuts will drop. You can walk away from the debate thinking we're at the mercy of the muses (in which case, we should all fear that unpredictably abrupt end to our writing career) or you can start developing techniques that unlock those ideas. The second method is probably so unpopular because it starts to sound like a job. 
