"Given that M&A is such a major prop to the market and that there are so many industries I just don't see deals in much longer, I have to refrain from even demonstrating faux enthusiasm," Cramer opined to a crowd of dealmakers and advisers at JW Marriott Essex House. To be sure, in 2017, Cramer predicted that the U.S. Department of Justice would lose its case seeking to block the merger of AT&T Inc. The AT&T-Time Warner deal has closed despite a pending appeal by the Justice Department, Arconic Inc. (ARNC) is reportedly weighing offers from private equity consortiums for all or some of its business after agitation from Elliott Management Corp. pressured the company, and Japanese semiconductor maker Renesas Electronics Corp. picked up Integrated Device in September for $7.2 billion.