Are all the columns in common between the 50 stored procedures? Even if you defined a temp table with enough columns to handle any of the stored procedures, you would still have to define which columns are going to be populated by the output of the stored procedures. For example

create table #temp (many many columns)

insert into #temp (colA,colB,colC)

exec stproc1

insert into #temp (colA,colC,colD,colE)

exec stproc2

insert into #temp (colA,colB,col,C,colD,colE,colF,colG...)

exec stproc99

There just isn't an "automatic" way to avoid all this with stored procedures.