No it's not, we only need to fill 3B or 2B, and maybe another SP, if Upton doesn't opt out. Our farm system has improved and is a year or two away from having some ready to play for the big club.
Either Bridwell or Ramirez could pitch out of the bull pen. For Ramirez pitching from the bullpen may be good for him returning from the torn UCL and he has pitched there before.
Meyer will be on the DL for the entire 2018.
Ramirez may not be available next year as well, depending on how well his UCL responds to the stem cell injections.
If Richards can stay healthy for the entire 2018 season he will be a #1, and may even contend for the Cy Young Award. So signing a solid #2, and filling the hole at 2B or 3B may be the way to go.
We are already paying Trout an average salary $24M/year. Would an extra $10-15M/ year stop us from signing FAs? I doubt it, because of all the dead weight we have coming off the books and the salary threshold goes up every year under the new CBA. Besides with inflation his salary won't seem as much by time it ends.