Not only are they genuinely 4 deep at WR but with Everett and Higbee at TE and Gurley and Henderson at RB they will have 8 viable receiving options. I don't think Rams' TEs will ever put up big numbers but they are situational threats.
My hope for Goff is not for him to throw it 600+ times for 5,000+ yards but to continue being efficient with the ball- maintain those 8.2+ YPA and 12.9 YPC figures and keep his QB rating above 100. If the defense improves ideally he throws it a little less this year (somewhere in between the 477 attempts in 2017 and 561 last year).