D. Scott Ferrin wrote in news
Atlas V Heavy might be delayed, but the basic capability
more or less exists by design. The mobile launch platform
reportedly is ready to be modified for Heavy when needed
and the modular design of the launcher means almost no
hardware development is needed.

What will drive the need is payloads, and that might not
develop during this decade.

It's not at all clear to me how the new joint venture
may effect either L-M's or Boeing's existing designs.

--Damon