With Enbridge Inc. planning a $28-billion takeover of Spectra Energy Corp., some investors say the industry&#39;s in store for more deals as pressure mounts on the likes of Enterprise Products Partners and Kinder Morgan to follow suit. The biggest pipeline deal of the year foreshadows a feeding frenzy as those companies that survived the collapse in oil and natural gas prices step up the hunt for bargains. TransCanada Corp. got the ball rolling with the $10.2-billion purchase of Columbia Pipeline Group Inc. earlier in the year.<br /> <br /> &quot;We&#39;ve just come through a very tumultuous period,&quot; said Libby Toudouze, a partner and portfolio manager at Cushing Asset Management in Dallas. &quot;Being able to survive the trough in the energy cycle, especially one like this last one that was so long, means you have to be bigger, faster, stronger.&quot;