The Miami Heat have won two straight titles with undersized Chris Bosh playing the bulk of the minutes at center. Timberwolves coach Rick Adelman often used 6-foot-6 Chuck Hayes at center when he coached the Houston Rockets. The Boston Celtics stayed relevant in large part thanks to Kevin Garnett's willingness to move from power forward to center.
Kills me how so many of the so called experts label whatever happened most recently a "trend". Just 3 seasons ago the Lakers dominated the league playing two seven footers. Back then the "trend" was toward stockpiling big men.
Now that the LeBrons have won two in a row, the "trend" is toward small ball. As soon as the Heat fail to win a championship, most likely this coming season, whoever wins and the method by which they win, will be declared the new NBA "trend". You really have to look further than the most recent NBA champion to discover real trends in the league.