能省则省，竟然省了，除非不得不保留，后面的not,没办法省。即使你加了so,不还是maybe表达肯定的那个意思吗，画蛇添足。另外 MAYBE SO不常见

你的想法是对的，原句中的 Maybe 完全可以说成 Maybe so。

Could we say, for example, that those who like bold flavours are bold themselves? Or, that those who like spicy food tend to have a hot temper? Maybe so. Maybe not.

又如（摘自柯林斯《英语语法系列·连词》）：

A：You’re probably better equipped to do it than he would be even if he were here. 即使他在这里，你也许比他更有条件做这事。

B：Maybe so. But it’s hard all the same. 可能是这样的。不过也一样难啊。(本句中的 so 也可以省略)