tl;dr:
# of current subscribers is irrelevant. Build authority.
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It's not about today - it's about building up your authority over time.
It's a near guarantee that you will be blogging (literally/metaphorically) just for yourself for ~ 6 months - and that's ok - you have to keep that big picture in mind.
So even if you have 1 person that signed - that's one person besides you that gives a crap about what you do. That alone puts you above most people.
Do whatever it takes to keep them engaged - from blog posts to skype conversations to whatever the hell it takes to build your community for when you really need it.
You will likely learn some lessons for when your audience s realy big - which is helpful for when you do have more attention and can't afford to be making those kinds of mistakes.