Many (perhaps even most when you look at our unscientific survey's we've hosted) people are successful booking a non home resort seven months out - provided they are flexible and/or NOT looking for a low supply room at a high demand time - like Grand Villas around Spring Break, or Boardwalk Villa Standard View rooms at Food and Wine, Hilton Head in the summer. Flexible means "willing to use the waitlist, willing to take a one bedroom over a studio, willing to move their trip by a week, willing to take VWL or BCV."
Moreover, by six months, availability has contracted even further - particularly for low supply rooms at high demand times - any Epcot area room for Food and Wine six months out will be lucky. High demand times start getting "spotty all over" - like early December.
By five months, even at lower demand times, availability may be spotty at smaller resorts - but you should be clear at larger resorts (except small supply rooms - like Grand Villas). It should still be possible to get something using the waitlist, but your probably sunk on those BW Villa standard view rooms or OKW Grand Villas for a whole week in a row (you might pick up a night or two).
Now, some folks are fine with this - they don't mind being flexible, they don't mind the waitlist. Other folks (like us or MG) it doesn't make any difference to - we book eleven months out at home and don't switch around. Other folks are disappointed because they believe there should be more availability for what they want when they want it (like their guide may have led them to believe) than there is and find waitlisting and calling right at seven months stressful.
But, there are less than 200 rooms at BCV - there will (barring an unforeseen expansion) always be less than 200 rooms at BCV. VAK will bring in more members - and
DVC won't stop there. And some of those members will occationally say "Hey, lets try BCV" (See SSR folks, it isn't you - any new member buying new points increases the competition). Therefore, many of us believe switching will continue to get harder over time.
We don't know what DVC will do next - they may feel they can expand outside WDW again - we've talked ski resorts and Mexican Riveria and Hawaii and West Coast around here in the past. If that happens, then the pressure on WDW resorts will be even greater.