The downgrade from Outperform to In-Line suggests a neutral outlook on Prologis by Evercore ISI Group, indicating that the stock might perform in line with the market or sector averages. The setting of a price target at $136 could imply that the analyst sees limited upside potential from the current levels, which might lead to a short-term stabilization or slight adjustment in the stock price. However, the impact is considered neutral due to the lack of a negative outlook and the presence of a specific price target, which can sometimes act as a support level.