We bought in 2005 when kids were 5 and 7 when we lived in ?MA. They are now 13and 16...and we are Florida residents living 1.5 hours away.
First off please don't buy anything based on your kids.... They grow into teens

and are pains in the butts.....
We had a pool, when they were little we spent so much time in there...then they grow up and now never use it.......oh Mom it's to cold, it's boring, it's too hot out...etc etc.
It's becoming the same with
DVC....they rather sit in the room and text their friends.

.....but I didn't buy it for them.....I bought it for me because I love Disney.........so if you are going to buy do it for you.
Life changes...we had so many awesome trips when they were young and staying at the BLT or BW or BC in a 1 brm was great for me. Having the w/d, king size bed and full kitchen and being able to walk to the parks makes it so worth it.
I love Disney and it's such a nice place to get away....but life changes........before we moved to FL we would visit in the winter to get away from the snow... So that nice change of scenery is not there anymore. If I stayed home I'd have the sAme weather.........but life will change again......grandchildren will come along......me and DH will take trips just the two of us or meet friends there from the north............
And if we get sick of going we can cruise or go skiing or to Europe or rent our points out to someone for the year...the going rate is about twice your MF's or we can sell right now for what we paid to buy in.
Your kids are the perfect ages for DVC.. They will be for another 10 years, after that who knows.....just plan for the next 5 to 10 years.
That's the great thing about DVC its so flexible.....and when it doesn't fit your life anymore...you can sell it. I don't think I'll ever sell because life is always changing.......in fact my DD13 friend from the north is meeting us at Disney next month and they get to experience Disney together ( it's her 1st time) so my DD is super excited......for this trip......but last trip 2 months ago....she was blah!
Like I said buy in because of you! It's great to have if you'll visit every year or every other especially with small kids.